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Biomolecule
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Diagram of a DNA polynucleotide chain showing linked deoxyribose sugars, phosphate groups, and nitrogenous bases (adenine, guanine, cytosine, thymine), with an inset comparing ribose and uracil in RNA. Detailed diagram of a plasma membrane's lipid bilayer showing two layers of phospholipid molecules with hydrophilic heads facing outward and hydrophobic tails inward, embedded cholesterol, integral (intrinsic) proteins spanning the membrane, peripheral (extrinsic) proteins attached to the surface, and sugar side chains extending from the outer face. Diagram showing the step-by-step process of DNA packaging: DNA wraps around histone proteins to form nucleosomes, which condense into chromatin fibers that further coil and fold to create a compact chromosome structure.
Large biological molecules: Carbs, lipids, proteins, and nucleic acids
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Large biological molecules: Carbs, lipids, proteins, and nucleic acids
Overview of large biological molecules.
Video: Encyclopædia Britannica, Inc.

Images

The polynucleotide chain of deoxyribonucleic acid (DNA)
A portion of the polynucleotide chain of deoxyribonucleic acid (DNA), with an inset...
Encyclopædia Britannica, Inc.
Molecular view of the cell membrane
Intrinsic proteins penetrate and bind tightly to the lipid bilayer, which is made...
Encyclopædia Britannica, Inc.
DNA packaging into chromatin and chromosome
DNA wraps around proteins called histones to form units known as nucleosomes. These...
Encyclopædia Britannica, Inc.
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